Specifically for the area mentioned: https://gwern.net/doc/genetics/heritable/2015-burt.pdf
But if you want a general criticism of these academic linear methods of observational analysis: https://arxiv.org/abs/2001.10488
But if you want a general criticism of these academic linear methods of observational analysis: https://arxiv.org/abs/2001.10488
He's quite a bad communicator; that happened to be written by students attending his lecture.